VANCOUVER - The Metro Vancouver regional district has issued an air-quality warning as a dense shroud of wildfire smoke descends over much of Western Canada.

Environment Canada has also expanded air-quality bulletins to more than 30 areas stretching from the Lower Mainland to the far northeastern corner of British Columbia, while higher-level warnings are in effect across most of Alberta and a portion of northwestern Saskatchewan.

The bulletin from Metro Vancouver says the heavy haze is expected to last a few days or until weather conditions change, and people are advised to avoid or limit outdoor activity due to elevated levels of fine particles in the air.

The Vancouver School Board says it has moved all activities indoors.

Metro Vancouver says the smoke is linked to high humidity an

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